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Classification of Amino Acids with respect to their essentiality:
| Essential |
Nonessential |
- Histidine*
- Isoleucine
- Leucine
- Lysine
- Methionine
- Phenylalanine
- Theronine
- Trypophan
- Valine
- Hydroxyproline
- Proline
- Serine
- Tyrosine
|
- Alanine
- Arginine
- Asparagine
- Aspartic acid
- Cysteine
- Cystine
- Glutamic acid
- Glutamine
- Glycine
|
*Histidine is required for infants but its essentiality for adults
has not been clearly established.
It will be seen from this statement that nine amino acids are essential
for maintenance of nitrogen equilibrium in human bodies. The estimated
requirements of essential amino acids for infants, children and
adults are given in Table B. Men in the older age group appear to
differ in their requirements. Studies seem to suggest an increase
need for methionine and lysine for them. Infants and children have
proportionally greater demands for essential amino acids than adults.
In addition, infants require histidine as an essential amino acid.
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